If you're sitting on a Manhattan multifamily portfolio, a founder equity position, or a long-held family business in Queens or Brooklyn, you already know the problem isn't just success. It's what success creates. Asset values rise faster than anticipated, liquidity often lags, and estate tax exposure can arrive before the family has a practical plan to deal with it.
For New York families, that pressure is sharper. A taxable estate can face the 40% top federal estate tax rate on transfers above the exemption amount, and New York adds its own estate tax layer for estates above its threshold, including the familiar planning issues that come with a separate state system. The current federal exemption was $11.18 million per individual and $22.36 million for couples under the Tax Cuts and Jobs Act in 2018, with a projected drop after the 2025 sunset to $5.43 million per individual and $10.86 million combined according to SEI’s discussion of IDGT planning under the TCJA. That means many families who felt comfortably outside the federal estate tax net may not stay there.
An Intentionally Defective Grantor Trust, or IDGT, is one of the most effective tools for moving future appreciation out of an estate without triggering the immediate friction many clients assume is unavoidable. The name sounds technical because it is. The idea is practical. You transfer growth. You retain an income tax burden that, in the right case, helps the strategy. You create an estate freeze around a valuable asset that you expect to be worth much more later.
Used well, an IDGT isn't a gimmick. It's a disciplined wealth transfer technique for people whose balance sheet has outgrown basic wills, revocable trusts, and annual exclusion gifting.
Preserving Your Legacy Beyond the Federal Estate Tax
A typical New York client who asks what is an intentionally defective grantor trust isn't looking for a textbook definition. They're looking at a balance sheet and seeing a future tax problem.
A real estate developer may hold stabilized properties through LLCs that throw off income but have appreciated far beyond original basis. A founder may own equity in a closely held company that isn't liquid today but could be worth dramatically more after a recapitalization or sale. A family office principal may already have used a meaningful portion of available exemption and now wants to transfer more growth without making a blunt outright gift.
Why the pressure feels immediate
For many New Yorkers, the concern isn't only the federal system. It's the combined drag of federal transfer taxes, New York estate tax exposure, and the fact that many high-value assets are illiquid. A family can be wealthy on paper and still have a cash flow problem when taxes come due.
That creates a familiar planning question. Do you wait and keep control, hoping future law changes are favorable, or do you move appreciating assets now while the transfer can still be structured on workable terms?
Practical rule: The best time to consider an IDGT is usually before the asset's next major appreciation event, not after it.
What clients are really trying to preserve
This isn't just about tax minimization. In practice, clients usually want three things at once:
- Control over the planning process: They want to decide who benefits, under what terms, and on what timeline.
- Protection for future appreciation: They don't want children or grandchildren inheriting a tax problem attached to the family’s best assets.
- A structure that fits New York realities: Real estate holding entities, operating businesses, and family investment structures need planning that matches actual ownership and cash flow patterns.
An IDGT sits squarely in that conversation. It lets a family shift future growth out of the taxable estate while preserving a level of design discipline that simple gifting often lacks.
Decoding the IDGT A Trust Designed to Be Defective
A New York founder may transfer nonvoting interests in a successful operating company to an irrevocable trust and still report the trust’s income on his own return. That result is not a drafting mistake. It is the design.
An IDGT is an irrevocable trust drafted so that the trust is outside the grantor’s taxable estate for transfer tax purposes, while the grantor remains the owner for income tax purposes under the grantor trust rules in Internal Revenue Code sections 671 through 677. Revenue Ruling 85-13 is the reason planners are comfortable with the basic sale technique. It holds that a sale between a grantor and the grantor trust is disregarded for income tax purposes.
Two tax systems. One trust.
The estate tax analysis and the income tax analysis do not line up, and that disconnect is the point.
For income tax purposes, the grantor is still treated as the owner. Interest, dividends, rental income, and capital gains are reported on the grantor’s personal return. For estate and gift tax purposes, if the trust is drafted and administered correctly, the transferred assets and their future appreciation are not brought back into the grantor’s estate.
That split gives the structure its economic force. The grantor pays the tax bill. The trust assets stay intact.
For a New York client, that matters more than generic articles usually admit. A grantor paying the income tax on trust earnings may be covering federal tax, New York State tax, and, if the grantor is a New York City resident, New York City personal income tax as well. That is a real cash burden. It is also a deliberate wealth transfer, because the trust is allowed to grow without liquidating assets to pay those taxes.
Why paying the tax can be an advantage
This is the feature many clients resist at first.
Non-grantor trusts reach top tax brackets quickly, and New York resident trusts can create a harsh combined tax result if income is trapped in trust. By keeping grantor trust status, the planning shifts that tax drag to the grantor personally, which lets the trust compound faster. In the right case, that is better than making additional taxable gifts over time.
The trade-off is straightforward. The grantor needs enough liquidity to carry that annual tax cost without straining the rest of the balance sheet. For an NYC real estate family, that may be manageable if the asset throws off cash. It is less comfortable if the trust holds a growth asset that produces little current income but large future appreciation.
Why “defective” does not mean careless
The word causes confusion. The trust is not defective in the ordinary sense. It is intentionally drafted to trigger grantor trust status through a specific retained power or substitution right, while avoiding estate inclusion.
That drafting line is narrow. If too much control is retained, the asset may be pulled back into the estate. If the trust is not operated like a separate vehicle, the IRS has more room to attack the structure. Trustee selection, valuation support, cash flow planning, and clean records all matter here.
One myth also deserves to be retired. The so-called 10% seed gift is not a statute, and it is not a fixed safe harbor. Practitioners often use that figure as a reference point for economic substance, but the right amount depends on the asset, expected cash flow, volatility, note terms, and the overall capitalization of the trust. In a closely held business or NYC real estate structure, a formulaic approach is usually the wrong one.
An IDGT works best for clients who can part with the asset economically, absorb the ongoing tax cost, and respect the formalities that keep the transfer outside the estate.
The Core Strategy The Sale to an IDGT Explained
A typical IDGT plan for a New York founder or real estate owner is not about making a modest gift and waiting. The actual transaction is a sale of a high-growth asset to the trust for a promissory note. If the asset outperforms the note’s interest cost, that excess appreciation shifts to the trust and stays out of the grantor’s taxable estate.
The concept is simple. The work is in getting the economics and documentation right.
In practice, the transaction usually starts with a smaller gift to capitalize the trust, followed by a sale at fair market value of the business interest, LLC interest, or other appreciating asset. The trust gives the grantor a note, and the note must bear interest at least at the Applicable Federal Rate in effect for the note term. The grantor trust features are drafted so the sale is ignored for income tax purposes, while the transferred asset is still outside the grantor’s estate if the structure is respected.
Start with capitalization, not folklore
The seed gift is there to give the trust real economic substance before the sale. That matters with any IDGT, but especially with assets that are hard to value, produce uneven cash flow, or sit inside layered entities.
The common “10% seed gift” talking point gets overstated. It is a planning convention, not a statutory rule. I do not treat it as a safe harbor, and experienced IRS counsel would not either. The right capitalization depends on the asset, the expected distribution pattern, the note terms, existing debt, and whether the trust can plausibly service the note without circular cash movement.
For an NYC real estate family, that analysis is often more nuanced than generic articles suggest. If the trust is buying an LLC interest that holds stabilized multifamily property with reliable distributions, the capitalization question looks different than it does for a development entity, a preferred equity position, or a closely held operating business where cash is trapped for growth.
The sale freezes value if the numbers work
After the trust is funded, the grantor sells the target asset to the IDGT for a note. That asset is often a noncontrolling LLC interest, a closely held business interest, or an interest in a family investment structure.
Fair market value has to be real, not aspirational. For nonmarketable assets, that usually means a qualified appraisal and a capital structure review that reflects restrictions in the governing documents, debt at the entity level, and any discounts that are supportable on the facts. New York clients holding real estate through LLCs often focus on the property and overlook transfer restrictions, sponsor rights, or debt covenants that also affect value.
The note is the estate-freeze piece. If the asset grows faster than the AFR charged on that note, the spread accrues for the trust beneficiaries rather than the grantor’s estate.
The note has to function like actual debt
Families sometimes pay close attention to the transfer documents and then get casual once the note is signed. That is a mistake.
The note should have commercially sensible terms, a payment schedule the trust can meet, and records that show those payments were made. Interest should be paid as required. Security, guarantees, and amortization terms should fit the asset and the risk profile. If the trust owns an illiquid NYC real estate entity that may not distribute cash for several years, a note designed for annual cash payments may be the wrong instrument from the start.
A sale to an IDGT is strongest when the paper matches the economics. If the trust has no realistic path to service the note, the structure invites scrutiny.
Why substitution power matters later
A well-drafted IDGT often gives the grantor a power to substitute assets of equivalent value. Used carefully, that can be one of the most practical features in the structure.
The value is not theoretical. A client may sell an asset expected to appreciate sharply, then years later decide that basis planning matters more than keeping that specific asset in the trust. A properly exercised substitution can bring a low-basis asset back into the estate and replace it with cash or higher-basis property of equal value. For New York families with highly appreciated real estate or business interests, that flexibility can affect the after-tax result as much as the estate freeze itself.
It also requires discipline. Equivalent value must be supportable, and the trustee has to act consistently with fiduciary duties and the trust instrument.
A clean sale to an IDGT usually follows this sequence:
- Create the IDGT with the grantor trust provisions needed for income tax treatment, often including a substitution power.
- Capitalize the trust with a seed gift sized to the asset and note structure, not by reflex.
- Value the asset carefully with appraisal support where appropriate.
- Sell the asset to the trust for a note that bears at least the AFR and has realistic payment terms.
- Administer the structure properly with separate accounts, actual note payments, and records that hold up under review.
For a quick visual explanation of the structure, this overview is useful:
The recurring implementation failures are predictable. Weak valuations, notes that are never serviced as written, trust accounts used like personal accounts, and entity documents that were never checked before the transfer. Those are not technicalities. They are the facts the IRS examines first when testing whether the sale should be respected.
A Practical Example An NYC Real Estate Investors IDGT Plan
A common New York fact pattern looks like this. An investor owns a valuable LLC interest that holds a Manhattan multifamily portfolio, a Brooklyn development site, or an operating business tied to local real estate. The asset is already worth enough to create estate tax exposure, but the larger concern is future appreciation. If that growth stays in the investor’s hands, the taxable estate grows with it.
An IDGT sale is often built for that problem. The investor first funds the trust with an initial gift, then sells the LLC interest to the trust for a promissory note. Because the trust is intentionally defective for income tax purposes, the sale is generally disregarded for income tax purposes under Revenue Ruling 85-13. The note fixes the value retained in the estate. The upside above the note’s hurdle rate shifts to the trust.
For an NYC owner, the asset choice matters more than generic articles suggest. A stabilized walk-up with modest rent growth may be a weak candidate. A carried interest vehicle, a development entity, a family operating company, or a recapitalized portfolio with real appreciation potential usually presents a better fit.
How the transaction is usually structured
In practice, the cleaner transfer is often the entity interest, not the deeded property itself. That keeps title, financing, contracts, and operating arrangements in the existing vehicle, assuming the loan documents, operating agreement, and transfer restrictions allow it.
A typical structure looks like this:
- Entity review first: Confirm that the LLC agreement, lender covenants, buy-sell terms, and consent requirements will not block the transfer.
- Initial trust capitalization: Fund the IDGT with a meaningful gift based on the asset, the projected cash flow, and the note terms. The old shorthand about a mandatory 10 percent seed gift is too rigid for serious planning. Solvency and economic substance matter more than reciting a formula.
- Valuation and note design: Obtain a defensible appraisal and set note terms the trust can realistically service.
- Sale closing: Transfer the LLC interest to the trust in exchange for the note and document the file as if a third party will review it later.
- Post-closing administration: Make actual note payments, maintain separate accounts, and respect entity formalities.
That middle step is where many plans become either credible or vulnerable. In New York, clients often focus on transfer tax exposure and miss the practical underwriting question. Can this trust carry the note from expected cash flow, distributions, or a planned refinance without looking circular or artificial?
What the freeze looks like economically
The estate now holds a note. The trust holds the appreciating asset.
If the asset outperforms the note’s interest rate, that excess growth accumulates for the beneficiaries outside the grantor’s estate. If the asset underperforms, the structure still works mechanically, but the economic benefit narrows and the planning cost becomes harder to justify.
Here is the simplified picture over a 9-year note term:
| Metric | Grantor's Estate | Inside IDGT (Tax-Free Growth) |
|---|---|---|
| Starting value | Promissory note reflecting the sale value | NYC property or business interest transferred to trust |
| During note term | Estate holds the note and receives payments under its terms | Asset continues to appreciate outside the estate |
| Appreciation effect | Future upside above the note doesn't return to the original asset owner | Growth above the AFR remains for beneficiaries |
| End of 9 years | Estate includes remaining note value, if any, rather than the full appreciated asset | Trust holds post-sale appreciation outside the estate |
That is the estate freeze in plain English. You keep a fixed claim. The beneficiaries get the future upside.
New York tax and planning considerations that change the analysis
Federal transfer tax is only part of the decision for NYC families. New York has no state gift tax, but taxable gifts made within three years of death are pulled back into the New York estate tax base under the state’s add-back rules. Timing matters. A client who is already older, in poor health, or considering a large transfer late in life needs that risk modeled directly.
SALT issues also affect asset selection and trust design. New York resident trusts can create state income tax exposure that generic IDGT discussions gloss over. If the trust will own income-producing interests, especially pass-through business interests or real estate entities with New York source income, the projected state and city tax burden should be part of the analysis from day one. For some clients, the federal estate freeze is still compelling. For others, the income tax drag, financing friction, or governance constraints make a different strategy more efficient.
The practical takeaway is straightforward. The best NYC IDGT candidates are appreciating assets with enough cash flow, liquidity events, or refinancing prospects to support a real note, backed by documents and administration that can survive scrutiny. That is a narrower group than the marketing pieces suggest, but for the right client it can move substantial future value out of the estate on terms the family can control.
Advantages and Critical Risks of Using an IDGT
An IDGT is powerful because it solves more than one problem at the same time. It can reduce estate tax exposure, move appreciation efficiently, and let the grantor continue carrying the income tax burden in a way that benefits beneficiaries. But the same features that make it effective also create real trade-offs.
Where the strategy is strongest
The strongest advantages tend to cluster around four points.
- Estate freeze: The sale exchanges future upside for a fixed note. That can be especially attractive when the asset is poised for meaningful appreciation.
- Grantor-paid tax burn: The grantor’s payment of the trust’s income tax reduces the grantor’s estate without being treated as a separate taxable gift under the framework described in the verified data.
- Better tax environment for trust growth: Trust tax brackets are compressed, so keeping the income tax burden on the grantor can preserve more capital inside the trust.
- Valuation planning opportunities: For closely held entities, appraisals and entity structure can shape how the transaction is valued and documented.
For many financially astute families, that combination is hard to match with outright gifts alone.
What clients often underestimate
The drawbacks are not side issues. They are central to whether the strategy should be used at all.
First, the trust is irrevocable. Once the asset is transferred and the sale is complete, you're operating inside a structure that can't be undone because family circumstances changed or the market moved against you.
Second, the grantor needs enough personal liquidity to pay the trust’s income tax. A client may like the planning result in theory and still be a poor fit if cash flow is tight or volatile. In New York, that concern is often magnified by city, state, and federal tax friction happening at the same time.
Third, the transaction has to look and operate like a real transaction. That means valuation support, clean documents, actual note administration, and disciplined trust records.
Some IDGTs fail in practice not because the concept is weak, but because the implementation is casual.
The basis trap is the issue many summaries miss
The most important risk to understand is the basis trap.
Assets held inside an IDGT generally do not receive a step-up in basis at the grantor’s death under IRC §1014, which means beneficiaries may inherit low-basis assets carrying substantial embedded gain. For appreciating assets such as NYC real estate, this can erode 15% to 30% of the trust’s after-tax value, as discussed in Peak Trust’s analysis of the IDGT basis trap.
That risk changes the planning conversation in a serious way. If the family intends to hold the asset indefinitely, the basis issue may be manageable. If the beneficiaries are likely to sell, refinance, or reposition the asset, the missed step-up can be expensive.
How sophisticated planners address the basis issue
The answer isn't to abandon IDGTs. It's to model them accurately.
Options often include:
- Using substitution powers thoughtfully: A grantor may be able to swap low-basis assets out of the trust before death.
- Selecting assets more carefully: Some assets are better IDGT candidates than others because future sale likelihood differs.
- Balancing transfer tax savings against future capital gains exposure: Sometimes the estate tax win dominates. Sometimes it doesn't.
- Coordinating with insurance or other liquidity tools: Families may need a broader structure, not a standalone trust answer.
A strong IDGT plan is never just “move the asset and forget it.” It should be reviewed as the asset appreciates, as basis issues grow more important, and as family objectives evolve.
Drafting Compliance and New York Specifics
A Manhattan developer transfers a minority LLC interest in a valuable property portfolio to an IDGT, signs a note, and assumes the hard part is over. It usually is not. The planning succeeds or fails in the documents, the paper trail, and the way the structure is administered after closing.
Drafting choices that matter
An IDGT must be defective for income tax purposes without causing estate inclusion. That sounds simple in outline and exacting in practice. A substitution power can be very effective if it is drafted carefully and administered properly. Trustee selection matters for the same reason. For New York families with operating businesses, investment entities, or contentious family dynamics, the trustee is part of the risk control system, not a ceremonial appointment.
The sale paperwork deserves the same level of care as the trust itself. Sloppy execution invites avoidable scrutiny and weakens the position that the transaction was bona fide.
- Appraisal support: Closely held entities, carried interests, and LLC interests need a valuation that can withstand review.
- Promissory note terms: Interest, amortization, maturity, security, and payment history should reflect a real creditor-debtor relationship.
- Banking separation: The trust needs its own account and a clean flow of funds.
- Consistent records: Trustee consents, note payments, entity books, and tax reporting should tell the same story.
The 10 percent seed gift myth
A common mistake is treating a 10% seed gift as a fixed rule.
It is not. There is no statute or regulation that imposes a universal 10% threshold for every IDGT sale. The better question is whether the trust is funded and documented well enough to support the sale as a genuine transaction under the facts at hand.
That distinction matters for New York clients. A business owner or real estate investor may want to conserve exemption, especially with transfer tax rules subject to change and other planning demands competing for the same balance sheet. In some cases, a larger seed gift is prudent. In others, it is unnecessary. The answer depends on asset quality, cash flow, note structure, valuation support, and the overall economics of the transaction.
A seed gift should be defensible, not formulaic.
New York planning requires a different lens
Generic IDGT discussions often stop at the federal estate tax. For New York clients, that is incomplete.
New York imposes its own estate tax and does not allow a state level gift tax offset in the way many clients assume. That makes timing, asset selection, and retained liquidity more important. If the grantor dies while still carrying substantial New York taxable assets outside the trust, the state tax cost can still be meaningful even if the federal result looks efficient on paper.
SALT pressure also changes the analysis. A grantor who remains responsible for income taxes on trust earnings needs the liquidity to carry that burden year after year. For a family office principal with large partnership allocations or an owner of New York pass-through entities, that cash cost is not theoretical. It affects distributions, debt service, and investment flexibility.
For NYC business owners and investors, I usually focus on three questions at the same time:
- What transfer tax exposure remains if the asset is never sold to the trust?
- How does New York estate tax affect the result, separate from the federal analysis?
- Can the grantor pay the ongoing income tax burden without creating strain elsewhere in the plan?
That is why IDGT planning in New York should be modeled with the rest of the capital structure. Net worth alone is not enough. Liquidity, entity governance, state tax exposure, and administrative discipline usually determine whether the structure holds up over time.
Is an IDGT Right for You Conclusion and Next Steps
An IDGT works best for a specific type of client. The profile is usually someone with a large estate, a concentrated asset expected to appreciate, and the financial capacity to live with an irrevocable structure while continuing to pay the income tax burden attached to trust growth.
For that client, the strategy can be extraordinarily effective. It freezes estate value, shifts future appreciation to heirs, and can move substantial wealth under terms that are more controlled than outright gifting. For New York families, it also belongs in the larger conversation about state estate tax, concentrated real estate holdings, and SALT-driven cash flow pressure.
It is not the only tool. In some cases, a GRAT, direct gifting strategy, or other irrevocable trust structure may be more appropriate. In other cases, the basis trade-off may outweigh the estate tax benefit, especially if the family expects a future sale of low-basis assets. That is why this planning should be modeled, not assumed.
If you're asking what is an intentionally defective grantor trust, the better question is usually this: does an IDGT improve your family's after-tax outcome once federal transfer taxes, New York exposure, cash flow, valuation, and basis are all considered together?
That answer requires numbers, asset-by-asset review, and drafting that matches the realities of your ownership structure. For a New York real estate investor, business owner, or family office, an IDGT can be exactly the right move. It can also be the wrong move if the asset, timing, or administration isn't right.
If you're considering an IDGT or want a second opinion on an existing estate plan, Blue Sage Tax & Accounting Inc. can help evaluate the strategy in the context of your full federal, New York, and family wealth picture. For closely held businesses, real estate entities, and multigenerational planning, an individualized review can clarify whether an IDGT, a GRAT, or a different transfer structure is the better fit.